Internal combustion engine



April 1936- A. T. BREMsER INTERNAL COMBUSTION ENGINE Filed May 23, 1953 8 Sheets-Sheet INVENTOR. Albert TBr'em/Jer I I ATTORNEY.

April 7, 1936.

A. T. BREMSER 2,036,253

INTERNAL COMBUSTION ENGINE Filed May 23, 1933 8 Sheets-Sheet 2 Fig.9.. Fi .8. Fig. 7

INVEN TOR.

AIbertTBm/nder A TTORNE Y.

April 7, 1936.

A. T. BREMSER 2,036,253

INTERNAL COMBUSTION ENGINE Filed May 25, 1953 a Sheets-Sheet 3 INVENTOR.

Albw'f TBremaw ATTORNEY.

April 7, 1936.,

A. T. BREMSER 2,036,253

INTERNAL COMBUSTION ENGINE Filed May 23, 1933 8 Sheets-Sheet 4 April 7, 1936. A. T. BREMSER INTERNAL COMBUSTION\ENGINE Filed May 23, 1933 s Sheets-Sheet 5 INVEJNTOR.

I Alb e71 TBremdef" ATTORNEY.

A ril 7, 1936. A. T. BREMSER INTERNAL COMBUSTION ENGINE Filed May 23, 1933 8 Sheets-Sheet 6 ivy/4511144,???

I N V EN TOR. A lberzTB/"er/Mer ATTORNEY.

April 7, 1936. A. T. BREMSEER INTERNAL COMBUSTION ENGINE Filed May 23, 1953 8 Sheets-Sheet 7 IN VEN TOR. TB/"efi'zder Albert A TTORNEY.

A. T. BREMSER INTERNAL COMBUSTION ENGINE April 7, 1936.

Filed May 23, 1953 8 Sheets-Sheet 8 .r m? NQ MM T m N N I R E wt m W I T. 13 .A T a; Z I A H Y B NQ ill Patented Apr; Z1936- UNITED-"STATES PATENT OFFICE My invention relatesto internal combustion en-l gins and more particularly to low compression en gines employing ignition apparatus to effect artificial ignition. By low compression engines is meant engines in which there is employed a compression ratio which will not produce self ignition of the fuel charge when the engine is in operation. By the term artificial ignition is meant ignition due to some external energy which is under such control that ignition of the "charge in the cylinder may be caused to occur at any predetermined moment in the engine cycle.

.iln object of my invention is to form a combustible charge of fuel and air in a low compression engine and ignite this charge by means of an artificialignition system in such a manner as to enable heavy and non-volatile fuels to be burned in such engines under widely varying con ditions of speed and load and at the same time to obtain most eflicient results in the fuel consumed in terms of power output-per cubic inch of cylinder displacement for a given fuel.

Another object is to provide a method of engine operation which at all leads will provide a predetermined amount of pure air in the cylinder which air will be caused to enter the combustion chamber after ignition of the fuel and air charge has set in to effect a complete combustion of the heavy components of the fuel charge.

A further object is to provideapparatus by which all of the above stated methods may be carried out.

In describing my invention it seems advisable first to explain at length the method and then to describe in detail one or more forms of apparatus by which the method may be practiced.

Explanation of the process In order to use liquid hydrocarbons as fuel for the operation of internal combustion engines of the type referred to, it is necessary to convert the liquid fuel into a dry vapor and this vapor must be mixed with sumcient air to effect complete combustion. In order to vaporize the liquid fuel during the short time available for the yaporizawhich are of known construction this large amount of kinetic energy causes the cloud of fuel droplets to scatter all over the cylinder and combustion chamber, and therefore produces at light engine loads and no load or idling a fuel air mixture too lean to be ignited safely and not uniform enough to be burned eificiently.

My method of charge formation utilizes the kinetic energy of the fuel droplets to maintain an uninterrupted fuel cloud at all engine loads and speeds, to place this fuel cloud'into the vicinity of the ignition point and to prevent the fuel from being difiused throughout the entire air in the combustion chamber at part loads and no load condition of the engine.

In my invention an atmosphere of pure air is provided in the cylinder and combustion chamber of an engine of the type referred to; The air in the combustion chamber is termed as an isolated portion of predetermined and fixed volume of the entire air charge. This fixed volume is equal or nearly equal to the compression volume. Liquid fuel is sprayed through the atmosphere of air contained in the cylinder during the compression stroke of the engine. The temperature of this air at this time is much higher than that of the fuel and in passing through the air the fuel droplets will absorb some of the heat of the air and this will tend to vaporize the outer surface of the fuel droplets and envelop them in a film of fuel vapor, which will act as an elastic cushion.

After passing through the air in the cylinder in an unobstructed manner the fuel droplets enveloped in a vapor jacket will enter the isolated portion of pure air in the combustion chamber and will strike against the hot walls of the combustion chamber at an oblique angle and will be deflected at approximately the same angle and continue to strike the walls of the chamber and continue to be deflected until their kinetic energy is spent or until they are completely vaporized. The vapor jacket around the fuel droplets will I prevent them from wetting the walls of the combustion chamber. The walls of the combustion chamber are heated very hot by the combustion gases and the action of the fuel droplets when striking against and bounding on? the walls is not unlike the action of droplets of water upon a hot stove or hot plate. Furthermore the fuel droplets are caused to enter the combustion chamber in such a manner that they will travel about the combustion chamber in the same general direction of rotation and since all the droplets are traveling at the same rate of velocity the entire charge of fuel will at all times during the process of the charge formation form an uninterrupted fuel cloud.

In the foregoing description the effect of the air in the engine cylinder and the combustion chamber upon the fuel jet has not been fully explained. The fuel jet leaves the spray nozzle at a velocity of several hundred feet per second, which, at full engine speed, may be 800 to 1000 feet per second. Since the air in the engine cylinder is comparatively still it is evident that the impact of the fuel jet upon the air will cause spreading of this jet in diameter. Air will mix with the fuel and will be carried along by the fuel, so that when the fuel jet reaches the passage connecting the combustion chamber with the cylinder, the fuel will be partly mixed with air. It is evident that if the air resistance which the fuel jet has to overcome would continue after. it has reached the entrance of the combustion chamber, the fuel jet would continue to spread in diameter and the fuel air mixture would finally become so lean that ignition at part load would be doubtful. If, however, the air resistance is eliminated or reduced, the fuel jet will not continue to spread. This is effected by imparting a predetermined velocity to the air, when passing from the cylinder, through the passage into the combustion chamber. The drawings indicate that this passage is restricted. It may be compared with the venturi of a carburetor or the riser tube of the inlet manifold of a single cylinder gasolene engine. Fuel and air are mixed in the Venturi and riser tube and a similar action takesplace in the passage referred .to, which may be termed Venturi or mixing passage. In passing through this passage additional air will be entrained with the fuel jet, so that a combustible fuel-air mixture enters the combustion chamber proper. This fuel-air mixture will be termed fuel cloud. It has been stated that in order to prevent further spreading of this fuel cloud the air resistance must be reduced or eliminated. The Venturi passage is suitably arranged with respect to the combustion chamber and the engine cylinder to direct the air in the direction of travel of the fuel jet and fuel cloud. The cross sectional area of this passage, and the piston velocity deterair velocity will decrease during the second half of the compression stroke, since the piston velocity decreases and since the air spends its kinetic energy and the velocity of the fuel cloud will likewise decrease, since it spends its kinetic energy while traveling about the walls of the combustion chamber. Therefore it may be stated, that if the velocities of the fuelcloud and of the air are the same or nearly the same. at one instant, while they rotate in the combustion chamber, they will not change relative to each other during the entire time interval which elapses until ignition occurs. Elimination or'material reduction of the air resistance prevents continued spreading of the fuelcloud, and elimination or material reduction of the relative velocity between the fuel cloud and the air-prevents excessive diffusion of the vapor and is being ignited when it is in the vicinity of the spark plug. The process of charge formation explained in the foregoing description represents the first one of two variations of the method of charge formation.

The second variation proposes to form a localized uninterrupted cloud of fuel vapor in substantially the same manner as set forth in the first variation with the exception that the velocity of the air entering the combustion chamber is substantially increased during the latter part of the compression stroke. The construction used to put this method into effect provides that upward movement of the piston partially closes off the passage for the air into the combustion chamber. A gradually restricted passage into the combustion chamber gives added velocity to the air which is forced through the passage. The result is what is called an intensified directed turbulence. This intensified turbulence imparts a very high velocity to the entire contents of the combustion chamber and therefore also to the fuel cloud and gives added centrifugal pressure to the fuel in this chamber so as to cause it to reasons as in the first variation described, that is,

since there is very little or no relative motion between the fuel cloud and the air while both are rotating in the combustion chamber. f

The characteristics of the fuel injection apparatus used in connection with the two vaniations of the method of charge formation will be illustrated and described later. These apparatus are of known construction.

Both variations of the method of charge formation provide that at any load condition of the engine all the fuel is being injected into the combustion chamber and is being retained therein. Since ignition takes place at approximately 5 degrees to 30 degrees before the top dead center of the compression stroke there is still an appreciable amount of pure air moving upward at the head of the piston. This air represents 2% to 8% of the piston displacement in volume and 10% to 30% in weight. In order to obtain a high power output per cubic inch of air drawn into the cylinder the maximum amount of fuel injected into the combustion chamber is such as to utilize all the air contained in the combustion chamber plus the amount of air in the cylinder to effect complete combustion. It is therefore evident that at the time of ignition when the engine is operating under full load condition the fuel air mixture contained in the combustion chamber is too rich to permit complete combustion. Therefore combustion will begin slowly and complete combustion will take place when and as additional pure air is supplied to the combustion chamber by the piston as it moves up to dead center position. I call this procedure controlled extended combustion. The result is that instantaneous explosion with the resulting detonation is avoided and that the construction employed to put the described method of charge formation into effect permits an unusually high (ill iii)

In the foregoing description it has been stated that the walls of the combustion chamber have to be kept ata fairly high temperature to assist the vaporization of the fuel droplets.

I have found, that, when operating an engine in accordance with the method of charge formation, which forms the subject matter of my invention, it was possible to obtain a very sudden increase in load and speed if the weight of air drawn into the engine for each engine cycle was progressively reduced when operating at one fourth full load or less and at slow speed idling. The amount of air for each engine cycle can be reduced by means of a throttle, such as known in carburetor engines. Throttling of the air increases the fuel consumption referred to useful power available in the flywheel, since it imposes an additional load on the engine. Increased fuel consumption results in hotter combustion chamber walls. The reduced weight of air results in less cooling of the combustion chamber walls 7 during the suction stroke of the engine by this air and also results in a higher temperature of the combustion gases. These results will tend to maintain the walls of the combustion chamber at such a high temperature that vaporiza- "tion of the fuel droplets will be greatly expedited.

Several examples of apparatus for carrying out the above methods will now be described.

Referring to the accompanying drawings, which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 illustrates diagrammatically one form of apparatus for carrying. out the method of charge formation forming the subject matter of the present invention,

Figures 2 and 3 illustrate diagrammatically variations of structure for carrying out the invention,

Figure l is a section on line lt of Figure 3,

Figure 5, view of the inside of the combustion chamber of anoth-er'form of apparatus and may be regarded as a section on line iiii of Figure 6 looking upward in the-direction of the arrows, and

Figure 8, a section on line t-ii of Figure 5.

Figures '2', B, 9, and ill illustrate various stages during the formation of the combustion charge showing diagrammatically a combustion chamber similar to those shown in Figures 2 and 5, when the engine is operating under full load, Figure 10, moreover, showing the combustion charge at the time of ignition.

Figures 11, 12, 13, and 1d areviews correspond ing to Figures 7 to 10 inclusive with the engine operating under idling or no load conditions.

Figures 11a, 12a, 13a, and 1410. are sections as indicated on Figures 11, 12, 13, and 1d respectively and show the fuel clouds at the various stages of the engine cycle,

Figures 7 to 14 inclusive show the extreme conditions of full load and no load but from these diagrams the diagrams of any load condition may be constructed. Figures 15, 16, 17, and 18 show diagrammatically the inside of combustion chambers illustrating the effect of air entering the combustion chamber during the latter part of the compression Stroke showing the air moving in the direction of the arrows which is the direction in which the fuel charge has entered or is entering the combustion chamber.

Figures 15a, 16a, 17a, and- 18a are sections as indicated respectively on Figures 15, 16, 17, and 18.

Figures 19, 20, 21, and 22 illustrate diagrammatically the formation of a fuel charge for no load condition of the engine in which the length.

of the fuel cloud from tip to tail is long enough to form a complete ring about the walls of the combustion chamber. In this form of fuel charge the period of injection of the fuel charge is of the same duration at no load as at full load condition and at any intermediate load condition. In this case the quantity of fuel injected is regulated by varying the pressure under whichthe fuel is injected.

Figures 23, 24, 25,-and 26 illustrate diagrammatically the charge formation when using apparatus such as that shown diagrammatically in Figure 3.

Figures 27,28, 29, and 30 represent diagrammatically the timing diagrams by which engines of the type referred to may be operated when using my method of charge formation.

Figures 31 and 32 illustrate diagrammatically the position of the piston at the time of ignition showing the combustion chamber filled with combustible charge while the cylinder space above the piston contains pure air, Figure 32 showing the position the piston will assume at the top of dead center at which time the air has been forced into the combustion chamber.

Figure 33 is anindicator diagram of an unextended and uncontrolled combustion at full load operating conditions.

Figure 34, an indicator diagram for full load operating conditions of an engine of the type referred to but employing a controlled extended combustion,

Figure 35, a vertical section of a four-cycle engine of the l.-head construction type illustrating more fully the subject matter of the invention,

Figure 36, a bottom view of the cylinder head of the engine shown in Figure 35, J7

Figure 37, a bottom view of a cylinder head Figure 38, a sectional view of another design r of cylinder head,

Figure 39,, a section on line id-dd of Figure 38, showing'inlet and outlet valves,

Figure-dd, a plan view of the bottom of the cylinder head or a section on line it-til of Figure 33,

Figure ll is a section on line iill of Figure 38,

Figure 4-2, a vertical section showing a form of cylinder head of the i'-head design,

Figure iii, a plan View of the underside of the cylinder head shown in Figure 42,

Figure it, a vertical sectional view of an engine, Y

Figure 4.5, a plan view of the underside of the cylinder head of an engine of the so-called F-type of head design,

Figure 16, a sectional view of'an engine of the valve-in-head type for carrying out my invention,

Figure d7, a. plan view of the top of the cylinder block or a section on line llll of Figure l6 looking down,

Figure 48, a plan View of the underside of the cylinder head of Figure it.

tion engine having a piston ll reciprocable therein. At one side of the cylinder I is the combustion chamber l2. A fuel nozzle [3 is positioned at one side of the cylinder 40 so as to project a cone shaped stream of fuel [4 across the cylinder and into. the combustion chamber l2. For purposes of description the stream of fuel will be thought of as composed of droplets and will so be described although this stream of fuel will actually be in the form of a finely divided spray The droplets of fuel will be caused to impinge against the circular wall of the combustion chamber and will be deflected around the walls .of the chamber as indicated by the arrows IS, the arrows, of. course represent the path of any one droplet of fuel. The whole mass of fuel will be proceeding in somewhat the same course. The fuel will be deflected-from the walls of the com bustion chamber at substantiallythe same angle with which it strikes these walls. It should be obvious also that theangle made by a path of fuel droplets will be necessarily less than 90 i. e. the angle IS in Figure l which is the angle between the path of the fuel droplets and a line I l tangent to the combustion chamber at the point which the droplets engage the walls of the combustion chamber'will be less than 90. In passing from the spray nozzle l3 into the combustion chamber the fuel must pass through a passage [8 between the upper end of the cylinder and the combustion chamber. In traveling from the spray nozzle to the passage IS the fuel charge encounters hot air which fills the space 48 above the piston ll. During its passage through this .chamber the fuel droplets are enveloped by air in the space l9 which is under compression and therefore heated so that some fuel from the outer surface of each droplet will be vaporized to envelop the droplet with 'a vapor jacket. The droplets with their jackets of fuel vapor around them will strike the hot walls of the combustion chamber and be deflected in the manner shown,

the operation being not unlike water droplets bouncing on a hot plate. The fuel charge will be sprayed through the nozzle l3 by any suitable apparatus. Several forms of suchapparatus will later be described. On the compression stroke the piston H will move from the position shown in Figure 1 further up until it reaches upper dead center at which time the air in the space IBwill be forced into the combustion chamber I2. The details of construction whereby these operations are carried out will be explained further on in the specification.

In the form of construction shown in Fig. 2 the combustion chamber is formed by (two small chambers 23 and 24 which have the shape of a body of rotation and which communicate with each other by opening 25. A spray nozzle 20 has two orifices directed to spray the fuel chargein two sprays Hand 22, one spray for each one of the small chambers 23 and 24. sprays likewise pass through the space above the engine piston and through passages 26 and 21 into the combustion chambersand strike the walls thereof, whence they are being deflected about these walls.

'and 34 the piston.

These fuel I In Fig. 3 twocombustion chambers 28 and 29 are shown which communicate with each other through an opening 30. A single fuel nozzle 3| is positioned to direct a spray of fuel 32 in the cone, however, is sufficiently small at the point where the fuel passes through the openings into -the combustion chamber that it will not engage the walls of the passages I8, 26, 21', etc. i. e. the spray of fuel will make its first contact against the hot inner walls of the combustion chamber into which it is directed' The construction of the form shown in Figure 3 is shown somewhat more inv detail in Figure 4 where numeral 33 indicates the cylinder block In this form the piston is shown at its upper dead center position at which time all air in the space at the end of the piston has been forced over into one of the combustion chambers 28 or 29 here shown as chamber 28. Inlet and outlet valves 35 are positioned, one in the combustion chamber 28 and the other in the combustion chamber 29. In this form of construction the piston 34, while traveling through the distance 36 on its upward stroke closes off the passage -i 8 almost completely, resulting in a directed intensified turbulent motion of the air from the cylinder to the combustion chambers 28 and 29. It will be remembered that directed intensified turbulence is one requirement to practice one of the two variations of the method of charge formation.

In Figures 5 and 6 is shown diagrammatically another form of construction of an L-head type of engine. In this form the fuel nozzle 31 is positioned at one side of the cylinder 38 and directs the spray of fuel through two channels 39 and 40 formed in the cylinder head. These channels communicate with combustion chambers 4| and 42. Inlet and exhaust valves, one of which 43 is only shown, are positioned in the combustion chambers. Line 44a indicates the location of the piston 44 with respect to the combustion chambers 4| and 42. In this form of construction it should be apparent that when the piston 44 is in its uppermost position the cross-sectional area of the channels 39 and 40 through which the air. is being transferred into the combustion chambers from the cylinder space Figures 7,' 8, 9, and 10 show diagrammatically the action of the fuel charges as they are sprayed across the cylinder into the combustion chambers. The illustrations represent the operation under full load conditions.

The operation may be regarded as that performed bythe form of construction illustrated in Figure 2. Iul igure 7 the fuel nozzle 20 has fill just begun spraying the fuel charge across the top of the cylinder.

In Figure 8 the fuel charges 2| and 22 have entered the combustion chamber and the charges are of a maximum length. The fuel charges are cone shaped. They leave the orifices of the spray nozzle as a compactliquid stream as shown in Figs. 7 and 8. While traveling across the cylinder athigh velocity this compact liquid stream breaks up into fine droplets which are separated from each other by air. An attempt has been made in the drawings to illustrate this condition by showing the fuel droplets as fine dots. The spaces between the dots is thought of as air.

The ratio between the weight of the fuel droplets and the weight of air separating these fuel droplets from each other is called the mixture ratio.

- In Figure 9 the fuel jet has ceased to discharge fuel and the fuel cloud has been completely formed.

In Figure 10 the fuel charge has been completely formed and has been circulated about the walls of the combustion chambers by its kinetic energy. This figure indicates the fuel charge as it is being ignited by spark plug 50.

Since under full load operating condition the combustion chamber is being substantially fully filled with the fuel charge as shown in Figure 10 ignition means 50 could be located at any local point of the combustion chamber, but since under no load and part load condition the fuel cloud fills only a portion of the combustion cham her the location of the ignition means W is definitely fixed by the location of the fuel cloud at no load to secure ignition at part loads and no load. By comparing Figures 7 to. 10 inclusive with Figures 11 to 14 inclusive this necessity may be fully understood. For convenience in describing the fuel charge the part ll of the fuel clcudstl, if, and ti etc. which first enters the combustion chamber will be termed the tipand the trailing end it, the tail.

The fuel jets described are shown in the drawings as continuous sprays. If the fuel jets are produced by certain types of spray nozzles, com-. monly known as closed type nozzles, the fuel jets will, particularly at part load injections, actually consist of a plurality of minute fuel discharges, on account of the vibrating action of the springloaded needle or check valve of the spraynozzle.

If, therefore the fuel charges were carried awayby a stream of air intersecting the path of the fuel jets, as they leave the fuel nozzle, it is evident that the fuel air mixture formed, would not be a continuous fuel cloud. The present invention permits the formation of a continuous fuel cloud.

It has been explained earlier in the specifications that the fuel jet will slow down while travelling toward the combustion chamber on account of the air resistance. Since the greatest air resistance exists at the tip of the fuel jet, this jet will slow down beginning with the tip. The remainder of the fuel jet, traveling at a greater velocity than the tip, will close up the gaps existing between the separate minute fuel charges, so that a continuous, uninterrupted fuel cloud is secured at the passage leading to the combustion chamher. The process described; is not unlike the action of a train of cars, when the first car is slowed down.

In Figures of the charge under idling or no load conditions is. illustrated. Figures 11 to 14 inclusive correspond iespectl lely to Figures 7, 8, 9', and ill in ll to 14 inclusive the formation' that they correspond to the same times of the engine cycle. Under no load operating conditions commencement of the fuel charge may be identical with the commencement of the fuel injection under full load conditions and termination of the injection under no load condition will then be earlier than under full load condition. In other words under full load conditions injection occurs during a longer period of the engine cycle than under no load conditions but under idling conditions and under any load conditions up to full load conditions injection may begin at substantially the same fixed time of the engine cycle. The result is what may be termed a. shorter fuel charge hi as illustrated in Figures l2, l3, and 14 than the fuel charge under full load operating conditions as shown in Figures 7 to ill inclusive. Figures 11 to 14 inclusive illustrate the extreme conditions of no load and Figures 7 to it illustrate full load conditions. The fuel charge between these conditions will be correspondingly governed.

From the foregoing explanation and from the illustrations in Figures 7 to it inclusive it is evident that the fuel air ratio of the fuel cloud is substantially the same at all engine loads, since the size and volume of the fuel cloud is reduced with the engine load.

In Figures 10 and It the arrows id indicate the direction in which directed turbulent movement of the air into the combustion chamber occurs during the compression stroke. The velocity characteristics of the air movement indicated by arrows til has been explained and it also was stated that there exists no or only very little relative movement between the air and the fuel cloud in the combustion chamber. The air velocity is a direct function of the engine speed and the velocity of the fuel cloud can be a direct function of the engine speed when certain lrnown fuel injection apparatus are used, and it is evident that, for instance, the tip M of the fuel clouds .dil

if in Figure 9 and of the fuel cloud ill in Figure l3 assume the same local position in,the-com-= bastion chamber, and that this position will re main the same regardless of the engine speed.

' Attaining of this precisely identical position is not required for the practical operation of the'engine since the fuel cloud, formed by my method of charge formation for no load condition of the engine, may cover substantiallyone half or more of the perimeter of the combustion chamber.

Figures 15 to is inclusive illustrate diagrammatically and progressively the edect of air enterbill Bill

the direction of thearrows of which is the some direction as the fuel charge is traveling. The

air causes the fuel charge to travel at an increased will have spread substantially over the convex .velocity around the walls of the combustioug; chamber and to ,form "initially a wall of fuel Y about these chambers as bestrhownin'hllcu c it.

ill

- thereafter.

portion of the combustion wall and may therefore be ignited at any local point or points of the said convex portion. The illustrations of Figures 15 to 1'7 inclusive is no load or idling condition. It should be apparent that at any other load condition the same effect will be produced by intensified directed turbulent motion of the air entering the combustion chamber. As the load is speed at which an engine of the type referred to' is to be operated and by the duration of the effect of the intensified turbulence upon the fuel cloud at that slowest speed. Therefore, spreading of the fuel cloud as shown in Figures 15 to 18 and 15a to 18a will be accomplished at all engine speeds.

In referring back to Figures 9 and 13 it will be noticed that the fuel clouds 22 and 5t are of different volume and of different length, the fuel cloud 5!! formed at no load operating condition of the engine being much shorter than the fuel clouds 2i and 22 for full load condition.

' In Figures 19 to 22 the charge formation for no load operating condition is progressively illustrated. But while the volume of the fuel clouds 53 is substantially the same as that of the fuel clouds 5| in Figures 12 to 14 inclusive, the length of the fuel cloud 53 is much greater than that of 5!. The fuel cloud 53 which is indicated as forming a complete ring about the walls of the combustion chamber is being produced by a fuel injection apparatus which produced at different engine loads a fuel spray of different volume but of the same or very nearly the same length. The effect of the air upon the fuel charge in the com bustion chamber is the same as that illustrated and described in Figures 15 to 13 inclusive.-

Figures 23 to 26 illustrate progressively the same phases of charge formation for no load operating condition as shown in Figures 11 to 14 but applied to the form of construction such as that illustrated diagrammatically in Fig. 3.

All types of fuel injection apparatus which are of suitable construction to be used on engines of the type referred to are of well known construction andI manifestly declare thatthe application of the various types of injection apparatus to an engine constructed to put any one of the two variations of the method of charge formation into practice do not represent variations of the method of charge formation as such.

Figures 27 to 30 inclusive illustrate timing diagrams according to which an engine of the type referred to may be operated if the fuel charge is being formed according to either one of the two the compression stroke. "Therefore the earliest time possible for the beginning of injection is at 54 of the compression stroke. I

In Figure 2'7 an injection apparatus of known construction is used in which injection at all loads and'no load condition of the engine begins at the same time of the engine cycle, namely at 55, while the duration of injection varies with the engine load so that'no load injection terminates This of course is only the case during at 56 and full load injection at 57. This-type of injection apparatus was used to produce fuel clouds in Figures 7 to 14 and Figures 23 to 26 inclusive.

In Figure 28 an injection apparatus of known construction is used in which injection at all loads terminates at substantially the same time of the engine cycle, namely at 58, while the duration of injection varies with the engine load, so that no load injection begins at 59 and full load injection at B0. In Figure 29 an injection apparatus of known construction is used in which the beginning and termination of injection at various loads occurs at different times of the engine cycle, so that no load injection begins at Bi and terminates at 62 and full load injection commences at 63 and ex tends to 64.

In Figure 30 an injection apparatus of known construction is employed in which the beginning and the termination of injection at different loads occurs at the same times of the engine cycle, so

that full load and no load injection commence at 65 and terminate at 66. This type of injection was used in Figures 19 to 22 inclusive. In this form of injection apparatus the quantity of fuel tion has terminated, at 61 which is between 5 degrees to 30 degrees before the upper dead center 68.

In the timing diagrams directed turbulent movement of the air from the cylinder into the combustion chamber begins at-54, continues to 68 if the engine construction for the first variation of the method of charge formation is employed. The directed turbulent movement of the air is increased to an intensified directed turbulent movement at a fixed moment during the compression stroke shown as 69, if the engine construction for the second variation of the method of charge formation is used. The point 69 represents the moment in the engine cycle, during the compression stroke at which the engine piston begins to close off the passage or passages connecting the engine cylinder with the combustion 29 may be had by reference to Figures 12, 13, and

14 as explained above. The fuel charge enters the combustion chamber and then the period of injection stops so that the fuel charge enters as an elongatedbharge having a tip 41 and a tall 48 as described, the tip being the portion of the fuel charge which first enters the combustion chamber and the trailing end of the charge the tail. Thedistance between the tip and the tail is the length of the fuel charge. The portion of the wall of the combustion chamber which at the timeof ignition is in contact with the fuel cloud may be called the range of contact. It is evident that the fuel cloud for no load or idlingjcondition of the engine is of apredetermined and definite length and that the location of the range of contact within the combustion chamber is definitely established and is fixed by the beginning and t "mination of the-injection with respect to the engine cycle. It should be evident also that as long as the ignition means are placed atone or more The piston continues to travel on its compression stroke from 61 to dead center 68. During is lower than 'inFlgure this latter travel the pure air at the end of the piston is forced into the combustion chamber to further promote combustion therein at full load and nearly full load condition of the engine. This in effect produces a continuation of pressure in the combustion chamber and results in practically a non-detonating action in the engine.

Figures 31, 32, and 34 illustrate what has been termed controlled extended combustion at full' load operating conditions and is applicable to both of the methods of forming a fuel charge illustrated above. In Figure 31, at the time of ignition the piston 14 is at the position indicated and must travel the distance Ill before reaching the top dead center I position Y 68. The combustion chamber i5 is substantially completely filled with the combustible fuel charge. The cylinder space ll above the piston contains pure air. After the ignition of the fuel charge the piston travels to the position shown in Figure 32. While traveling from the position shown in Figure 3i to that shown in Figure 32 the free air is forced through the channel it into the combustion chamber. This air serves to complete the combustion in this chamber during the latter period of the stroke and will extend the duration of combustion even beyond the upper dead center.

In Figure 33 is shown a typical indicator diagram of an engine in which there is no extended controlled combustion at full load operating conditions. Combustion takes place substantially at what is generally termed constant volume. erefore the maximum pressure is relatively high.

f Figure 34 represents an indicator diagram for lull load operating conditions oi an engine of the type referred to but employing a controlled extended combustion. Though the compression pressures of Figures 33 and 34 are of the same magnitude, the maximum pressure in Figure 34.- 33 and combustion takes place partly at constant volume and partly at constant pressure. 7

. Figures 35 'andibd illustrate in cross section a tour cycle engine or" the l..-head construction which operates in accordance with my invention.

.is includes cylinder block lid of conventional construction having a piston til movable therein and connected by a connecting rod M to a crank shaft iii of conventional construction. A combustion chamber M is formed at the end of the cylinder ina head 85. Inlet and exhaust valves at and ti! are positioned within the combustion chamber, thecombustion chamber being oi sumcient depth to permit unobstructed opening of said valves. A circular pocket bil is formed in 5 the bottomol the cylinder head and is, in line i 1 with the cylinder bore ,89 and serves to receive the piston' head tiwhen the piston is injthe upper dead center position. This construction provides intensified turbulence during the latter part of the compression stroke. A spray nozzle s mounted in the side of the cylinder head 85 ar 1 'is positioned so as to direct the fuel spray substantially at a right angle to the vertical axis of the cylinder 89. The fuel jets are arranged so as to travel in paths 9| and 92 across the space 98' operation this pocket may not be explained here.

therein, the fuel jets being permitted to travel in an unobstructed manner. Fuel is supplied to the spray nozzles 90 by a fuel pump 93. This pump; may be of any suitable known construction. Fuel is supplied to the injectors through the pipe 94. The fuel pump 93 is operated from the crankshaft 83' by means of sprockets 95, 95 and 91 and a chain 98 'of any suitable construction. Spark plugs 99 of known construction are mounted in the cylinder head 85. These spark plugs may be set back from the inner wall of the cylinder head in pockets iflil. In practical be approximately /8 inch in depth. The fuel cloud moves at all loads and at all speeds of the engine across the pocket till. Electric energy for creating the spark is supplied by a cable ltl. trc energy and the means fordistributi-ng the energy to the spark plugs in a properly timed manner are of well known construction and need The cylinder head lb is provided with a water jacket 1192 which jacket communicates through a bore ltd with the space was surrounding the cylinder. A space lib is formed between the wall ltli of the combustion chamber and the inner wall ml of the water jacket till. This space does not contain cooling water so that the wall Wt may be heated much hotter than it would be otherwise. The fuel charge which sweeps across the top of the cylinder and through the combustion chamber will strike the hot walls lilt of the combustion chamber. Actual tests of an engine constructed in into the combustion chambers formed above the inletand exhaust valves. The arrangement is .such that the fuel jets travel across the cylinderbore and through the air under compression The source of the elecaccordance with the method herein explained show that when operating under full load conditions the wall of the combustion chamber though not cooled by water is nevertheless not heated to too high a temperature but remains dark. The inlet valve 86 is positioned in an inlet port ltl which is connected to an inlet manifold Hill and. is controlled by a butterfly valve lit. The butterfly valve is mounted upon a shaft ill to which is attached a lever ill. A lever ill on the fuel pump is connected by means of a link lid with the lever i it. At the end adjacent the butterfly valve the lever ill" is slotted at lib in which slot engages a pin lit on the lever llll. As will be apparent a, lost motion is permitted between the lever ill and the lever ill. With the butterfly valve in a given position the linear distance which the link ill may travel without moving lever ill is equal to the length of the slot lib which is represented by C. The butterfly valve till is held biased to wideopen position against I pump is operating at full load injection, b repre sents the position of the lever at one-fourth A.) load injection and point (I the position of the lever at slow speed or idling condition of the engine. From the explanation given it should be apparent that the butterfly valve will remain wide open between approximately one-fourth load and full load operating conditions of the engine since the link lM when beng moved while the l'ver i l3 swings from point a to point D will slide on the pin lit of the lever H2 until the end of the slot i l5 contacts the pin l i6. While the lever H3 is being moved from point D to point d the link lid will swing the amount indicated by angle e and will cause the butterfly valve to oscillate about its axis by an amount indicated by the angle 1 and in so doing the butterfly valve will reduce the. eflective cross sectional area through which the air has to pass before entering the engine cylinder and thereby reduce the amount of air drawn into the cylinder.

During the idling of the engine and at slow speed the smallest amount of air in the cylinder is desired. The position of the butterfly valve corresponding to the smallest amount of air at the desired slow speed is being determined by the speed and by the no load position of the control lever I I3 of the fuel pump. The control lever II3 of course is operated by the operator of the engine as desired. The reason for regulating the amount of air at slow speed, at no load and at light load operating condition have been explained'in the description for the method of forming the fuel charge.

In the form of engine shown in Figures 38 to 41 the cylinder block III is of known construction having a cylinder head M8. The inside of the cylinder head is provided with a metal shield II9 against which the fuel spray I is projected from the fuel nozzle I2I. Combustion chambers I 22 and I23 are formed about-inlet and exhaust valves I24 and H5. Channels I26, I27 are formed in the underside of the cylinder head ll Iii. These channels run from the spray nozzle IZI across the cylinderinto the channels connecting the circular sections of the combustion chamber with the cylinder. These channels provide unobstructed passages for the fuel from the spray nozzles to the combustion chambers. A single spark plug I 28is positioned in the space joining two circular portions of the combustion chamber. It will be apparent that the air which is delivered into the combustion chamber going in the direction of the arrows shown in Figure will be traveling inthe direction of the fuel jets which are delivered into the combustion chamber.

Figures 42 and 43 illustrate another form of an engine of the T-head design having a cylinder block I28,a piston I29 movable therein and a cylinder head i36. The combustion space consists of two circular chambers I3I, I32 located directly above and around inlet valve I33 and exhaust valve I34. A single spray nozzle I35 is positioned in the center of the cylinder head and controlled to direct jets of fuel in opposite directions into the combustion chambers as best shown in Figure 43. Spark plugs I36 are positioned in each of the combustion chambers. In Figure 42 the piston is shown in its upper dead center position. Fuel injection occurs and ignition occurs while there is still a substantial clearance between the end of the piston I29 and the inner wall of the cylinder head I30. The fuel jets are permitted to travel across the space at the head of the piston and to enter the circular portions of the combustion chambers in an unobstructed path.

Figures 44 and 45 illustrate diagrammatically a .cross section through the cylinder block I31 and the cylinder head I38 of an engine of the socalled F-head design. The cylinder block pref erably carries exhaust valve I 39. The cylinder head preferably carries an inlet valve I 40. The bottom of the cylinder head, as is best shown in Figure 45, hassa p'ocket I4I which is a continua.- tion of the cylinder bore and serves to receive the head of. the piston I42 which, when in the upper dead center position, substantially fills this pocket. The bottom of the cylinder head conare swept by the hot exhaust gases only wherebythey will remain at a sufliciently high temperature.

Figures 46, 47, and 48 illustrate a form of valvein-head engine having a cylinder block I46 and a piston I 47 movable therein. The combustion chamber I48 is substantially the same as that shown in Figure 1. This combustion chamber'is formed partly in the cylinder block and partly in the cylinder head I49. Spray nozzle I50 is mounted in the upper end of the cylinder block and directsa jet of fuel across the space at the head of the piston and into the combustion chamber. A shield I5I may be positioned in the com bustion chamber against which the jet of fuel impinges. The piston I4? is shown in Figure 46 in a position it assumes during the injection period, and is approaching the bottom of the cylinder head I49 and moves upwardly until the clearance at the head of the piston has reached the smallest practical minimum which may be approximately one sixteenth (1 5) of an inch. Inlet valve I52 and outlet valve I53 are mounted in the cylinder head I49. A spark plug I54 is also mounted in the cylinder head-in the wall of the combustion chamber.

Figures 49, 50, and 51 show still another variation of a valve-in -head type of engine having a cylinder block I55, a piston I56 and a cylinder head I5I. This form diflfers from that shown in Figures 46, 47, and 48 only in that the combustion chamber I58 is turned 90 so that the plan of the cylinder block as shown in Figure 50 coincides with the sectional view indicated in Figure 46. Also while inFigure 46 the spark plug is located directly in the wall of the combustion chamber, in Figure 49 the location of the spark plug I59 is indicated as in close proximity to the perimeter of the combustion chamber. The distance from the perimeter of the combustion chamber is determined by the depth of the fuel cloud which fuel cloud is shown in Figures 15 and 16.

Figures 52 and 53 illustrate diagrammatically the cylinder I60 and piston I6I of a two-cycle This form has a combustion chamber" engine. I62 formed in the cylinder head I63 which chamber is substantial'y spherical in shape. In Figure 52 the piston is shown in the position at the end of the fuel injection. At the upper dead center position the smallest possible clearance will be obtained between the end of the piston and the inner wall I 64 of the cylinder head. The intensified turbulent movement of the air from the end of the piston I60 into the combustion chamber is obtained, and at the time of ignition a fuel vapor film will cover the wall of the ball-shaped combustion chamber, this fuel film being distributed over the wall substantially in the same manner illustrated in Figures 15 andlfi. Aspark plug I65 is mounted in the cylinder head and in the wall of the combustion chamber. A metal shield I66 covers the entire wall of the combustion chamber. One purpose of this shield is to preserve a suflicient amount of heat for vaporization of the fuel charge. The location of the spark plug is relatively unimportant since the entire wall of the combustion chamber is lined with fuel. The spark therefore may be located at the most convenient point. A fuel spray nozzle IE1 is positioned in the cylinder head and directed so as to send a stream of fuel across the space at the head of the piston and into the combustion chamber. v

The drawings disclose ignition means in the form. of electric sparkplugs. These plugs may [be of the usual type used in gasoline engines.

The sparkplugs receive electric energy from a source such as an electric battery in connecting with a usual high tension coil, a condenser and a distributor. The high tension coil can be of the vibrating type, so that a plurality of sparks occur during a predetermined time interval of the engine cycle. A high frequency alternating electric generator producing preferably during a fixed time interval of the engine cycle an ignition are across the electrodes of the sparkplug may also be used as a source of electric energy. if such an ignition apparatus is employed, for instance, on the engine shown in Figures 5, ii, 38, i0, and ii an ignition arc may be produced on the sparhplugpreferably during the last 45 de grees of the compression stroke and the fuel injection will then be timed to begin at a predetermined moment of the compression stroke, so that the tip of the fuel cloud will contact the ignition arc at approximately 25 to 5 degrees before the end of the compression stroke, depending on the engine speed and load. From the above named drawing, it is obvious that the fuel injection period may entered into the downstrolre, following the compression stroke. At part load operating condition of the engine a localized combustible fuel-air mixture is formed while the fuel travels from the injection valve towards the sparlkplug in substantially the same manner as explained earlier in the specification. Referring to Figures 7 to ill, it can be assumed that an ignition are or a plurality of successive sparks occur on the sparliplug till during the time interval of the engine cycle during which. the various steps of the charge formation illustrated occur. Figure 7 may illustrate the engine condition at approximately 45 degrees before top dead center and Figure ill the engine condition at top dead center of the compression stroke. When the tip ll of the fuel cloud contacts the ignition are,

occurring on the sparhplug, it will be ignited.

This position of the fuel cloud is approximately illustrated in Figure 9. "fire burning tip ll will continue its travel and unburnt portions of the fuel cloud will pass through the ignition arc. ft is obvious that the fuel clouds formed for part lead conditions of the engine, as shown in Figures ii to it and iii to 26 may be ignited in substantially the same manner as explained above.

From the foregoing it is obvious that many types of ignition apparatus may be employed to ignite the fuel clouds formed according to the method of charge formation described, without departing from the spirit of the present invention. it isalso clear that the time of injection is not limited to that shown in thetimingdiagrams of Figures 2'? to 30. These timing diagrams illustrate the close interrelation between the time of injection and the time ofiignition if the engine is operated so that the moment at which a single sparlr or the first one of a plurality of sparks occur on the sparhplug is substantially identical with the moment of begin- -beginning of combustion.

ning of combustion of the fuel cloud. In other words, the timing of the spark determines the If, however, a plurality of successive sparks occur, for instance our.-

ing the last 45 degrees of the compression stnike,

as explained above, it is obvious that the begin ning of combustion can be determined by the beginning of. the fuel injection, and it can be varied by varying the beginning of the fuel injection within the range of duration ofthe suc-- cessive sparks or the ignition are.-

It will be obvious to those skilled in the art that various changes may be made in my device without departing from the spirit of the invention and therefore I do not limit myself to what is shown in the drawings and described in the specification, but only as indicated by the appended claims. I

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is: v

1. In an internal combustion engine, means for forming a fuel'charge comprising a fuel spray nozzle, a combustion chamber, a cylinder bore between said fuel nozzle and said combustion chamber and passage means between said chamber and said cylinder bore whereby the fuel sprayed from said nozzle will be sprayed across the upper part of said cylinder and will pass unrestricted through said passage into said combustion chamber, and timed ignition means for igniting the fuel charge in said combustion chamber, substantially as set forth.

2. An internal combustion engine comprising an engine cylinder, means adjacent said cylinder providing a combustion chamber means providing a passage between said cylinder and said chamber, said passage having sufficient cross-sectional area to permit unobstructed entry of a fuel spray into said combustion chamber, means providing an opening for the admission of an aircharge to said cylinder and to said combustion chamber, means providing timed artificial ignition in said combustion chamber, means for injecting atomized liquid fuel at part load across or partly across said cylinder into said combustion chamber to form at least about part of the wall of said combustion chamber a combustible fuel-air mixture and said fuel injection means being constructed so as to impart suihcient velocity to said fuel to move said fuel-air mixture to the vicinity of said ignition means and said injection means being timed to place said fuel-air mixture into the vicinity of said ignition means at the time of ignition.

3. An internal combustion engine comprising an engine cylinder, means adjacent said cylinder providing acombustion chamber, means providing a passage between said cylinder and said chamber, means providing an opening for the admission of an air charge to said cylinder and to said combustion chamber, means to cause compression of said air charge and to effect displacing thereof from said engine cylinder into said combustion chamber, means for injecting a spray of atomized liquid fuel at part load across or partly across said cylinder into said chamber to contact the walls of said chamber while maintaining the continuity of said spray, said fuel injection means being constructed so as to impart sufflcient velocity to said fuel to move it to the vicinity of said ignition means and said injection means being timedto place said fuel into the vicinity of said ignition means at the time of ignition, means associated with said wall to eflect Bit vaporization of said atomized fuel while it travels towards said ignition means, and said cylinder arranged with respect to said passage and said chamber to cause the flow of air effected by said compression means to follow the general direction of said fuel spray and to produce an air velocity approximately equal to the velocity of said fuel spray to prevent material diffusion of said fuel into said air within the said combustion chamber.

4. In an internal combustion engine a cylinder and a piston arranged therein, means forming a combustion chamber in the shape of a body of revolution, means forming a passage between said chamber and said cylinder, said passage being arranged with respect to said chamber to introduce air into and cause rotation thereof in said chamber about the axis of said chamber during the compression stroke, means for injecting atomized fuel across or partly across said cylinder through said passage into said chamber to form while traveling through the air in said cylinder, and when entraining with a portion of the air flowing through said passage, a fuel cloud of predetermined dimensions, timed ignition means located in said chamber, said ignition means being timed to ignite said fuel cloud upon movement thereof to the vicinity of the ignition means due to the kinetic energy imparted to said fuel by said injection means.

5. In an internal combustion engine a cylinder and a piston arranged therein, means forming a combustion chamber in the shape of a body of revolution, means forming a passage between said chamber and said cylinder, said passage being arranged with respect to said chamber to introduce air into and cause rotation thereof in said chamber about the axis of said chamber during the compression stroke, means for injecting atomized fuel across or partly across said cylinder through said passage into said charnber to form while traveling throughthe air in said cylinder, and when entraining with a portion of the air flowing through said passage, a fuel cloud of predetermined dimensions, timed ignition means located in said chamber, said ignition means being timed to ignite said fuel cloud upon movement thereof to the vicinity of the ignition means due partly to the kinetic energy imparted to said fuel by said injection means and partly due to said air moving in the direction of said fuel cloud.

6. In an internal combustion engine a cylinder and a piston arranged therein, means forming a I combustion chamber in the shape of a body of revolution, means forming a passage between said chamber and said cylinder, said passage being arranged with respect to said chamber to introduce air into and cause rotation thereof in said chamber about the axis of said chamber during the compression stroke, means for injecting atomized fuel across or partly across said cylinder through said passage into said chamber toform while traveling through the air in said cylinder, and when entraining with a portion of the air flowing through said passage, a fuel cloud of predetermined dimensions, timed ignition means located in said chamber, said ignition means being timed to ignite said fuel cloud after spreading of said cloud about the walls of the combustion chamber has been eifected due to the velocity of said rotating air and due to the kinetic energy imparted to said fuel by said injection means.

7. In an internal combustion engine of L-head construction employing fuel injection and timed passing therethrough into said chamber towardssaid apex, so that said'charge will be divided'to v rotate substantially as two separate portions.

8. A two cycle internal combustion engine comprising a cylinder and a piston arranged therein, -a combustion chamber of substantially spherical shape arranged adjacent said cylinder and laterally at the upper end thereof, a passage between said chamber and said cylinder, entering said chamber tangentially, a fuel nozzle arranged on said cylinder and substantially opposite said chamber and in line with said pas' sage, said piston adapted to progressively reduce the cross sectional area of said passage during the latter part of the compression stroke and timed ignition means in said chamber.

9. In an internal combustion engine with timed ignition having an engine cylinder, a combustion chamber and a passage between said engine cylinder and said chamber, the method of forming and burning a combustible fuel air mixture which comprises, compressing an atmosphere of air in said cylinder and chamber, injecting atomized fuel across or partly across said cy inder towards said passage during a predetermined interval of the compression stroke simultaneously'causing an air movement from said cylinder, throigh said passage into said chamber, regulating the duration of 'the injection interval in proportion to engine load so that the fuel will mix with a predetermined and variable portion of said air flowing through said passage to form a combustible fuel cloud prior to their entry into said combustion chamber, and igniting the fuel cloud upon its entry into said combustion chamber, at least at part load operation of the engine.

10. The method of charge formation and combustionas claimed in claim 9 further characterized in that the linear distance from the spray nozzle to the ignition means, the velocity of the fuel jet across the cylinder and the timeof injection are interrelated so that at least the tip of the fuel cloud is within the combustion chamher at the time of ignition.

11. An internal combustion engine comprising a cylinder-block, a cylinder in said block and a piston in said cylinder, a cylinder. head; inlet and exhaust valves in said cylinder head, said valves opening into said cylinder, a combustion chamber in the shape of a body of revolution formed jointly by said cylinder block and said cylinder head, said chamber arranged adjacent the upper end of said cylinder and laterally of said cylinder and in communication with said cylinder, a spray nozzle arranged on the upper end of said cylinder substantially opposite said chamber whereby fuel sprayed from said nozzle will travel across said cylinder and will enter said chamber tangentia1ly, ignition means in said chamber and said piston adapted to progressively separate said combustion chamber from said Ill till

lid

is formed as a cavity ln'said cylinder block and the other half in said cylinder head.

13. An internal combustion engine as claimed in claim 11 further characterized in that the combustion chamber is formed as a cavity insaid cylinder block.

jection means on said cylinder, positioned to di-' rect a spray of fuel across at least part of said cylinder through said passage to be deflected about said peripheral wall, and said ignition means positioned in the path of said fuel spray, the method of forming and burning a combustible fuel charge which comprises providing an air charge in said cylinder and chamber, transferring said charge contained in said cylinder into said chamber, injecting during the compression stroke atomized fuel at high velocity across said cylinder into said chamber to impregnate a portion of said air charge with fuel and to move said impregnated portion past said ignition point,

rotating said air charge in said chamber in the direction of travel of said impregnated portion to prevent material diffusion of the latter and igniting said portion at said ignition point.

15. In an internal combustion engine having a cylinder, a piston a combustion chamber with curved peripheral wal, a passage arranged tangentially with respect to said chamber, timed ignition means in said chamber and timed iniection means on said cylinder positioned to direct a. spray of fuel across at least part of said cylinder through said passage to be deflected about said peripheral wall, and said ignition means positioned in the path of said fuel spray, the

method of forming and burning a combustible fuel charge which comprises providing an air charge in said cylinder and chamber, transfer ring said charge contained in said cylinder into said chamber, impregnating a variable portion of said air charge in proportion to engine load to form a combustible fuel cloud and moving said fuel cloud to the vicinity of said ignition point by-injecting during the compression stroke atomized fuel at high velocity across at least part of said cylinder into saidchamber, rotating the unimpregnated portion of air in said chamber in the direction of travel of said fuel cloud to presyent material diffusion of the latter and igniting said fuel cloud 'when a predetermined portion thereof is in the vicinity of'said ignition point.

16. In an internal combustion engine having a cylinder, a piston, a combustion chamber with curved peripheral wall, a passage arranged tangentially with respect to said chamber, timed ignition means in said chamber and timed injection means on said cylinder positioned to direct a spray of fuel across at least part of said cylinder through said passage to be deflected about said peripheral wall, and said ignition means positioned in the path of said fuel spray, the method of forming and burning a combustible fuel charge which comprises providing an air chargein said cylinder and chamber, transferring said charge contained in said cylinder into said chamber, impregnating a variable portion of said air charge in proportion to engine load'to form a combustible fuel cloud and moving said fuel cloud to the vicinity of said ignition point by injecting during the compression stroke atomized fuel at high velocity across at least part of said cylinder into said chamber, rotating the unimpregnated portion of air in said chamber in I the direction of travel of said fuel cloud to prevent materialgdiifusion of the latter, beginning the period of fuel injection after said air charge has been admitted to said cylinder and terminating it before ignition takes place and igniting said fuel cloud when a predetermined portion thereof is in the vicinity of said ignition means.

17. In an internal combustion engine having a cylinder, a piston, a combustion chamber with curved peripheral wall, a passage arranged tangentially with respect to said chamber, timed ignition means in said chamber and timed injection means on said cylinder, positioned to direct a spray of fuel across at least part of said cylinder through said passage to be deflected about said peripheral wall, and said ignition means positioned in the path of said fuel spray, the method of forming and burning a combustible fuel charge which comprises providing an air charge in said cylinder and chamber, transferring said charge contained in said cylinder into said chamber, impregnating a variable portion of said air charge in proportion to engine load to form a combustible fuel cloud and moving said fuel cloud to the vicinity of said ignition point by injecting during the compression stroke atomized fuel at high velocity across at least part of said cylinder into said chamber, rotating the unimpregnated portion of air in said chamber in the direction of travel of said fuel cloud to prevent material diffusion of the latter, relating the velocity of injection of the fuel charge, the time of injection and the time of ignition so that ignition occurs when the range of contact of the fuel cloud formed underall load conditions overlaps said ignitionv point. 0

18. In an internal combustion engine having a cylinder, a piston, a combustion chamber with I of forming and burning a combustible fuel charge which comprises providing an air charge in said cylinder and chamber, transferring said charge contained in said cylinder into said chamber, impregnating a variable portion of said air charge in proportion to engine load to form a combustible fuel cloud and moving said fuel cloud to the vicinity of said ignition point by injecting during the compression stroke. atomized fuel at high velocity across at least part of said cylinder into said chamber, rotating the unimpregnated portion of air in said chamber in the direction of travel of said fuel cloud to prevent material diffusion of the latter, regulating the quantity of air provided in said cylinder and chamber to progressively increase the fuel air ratio of said fuel cloud and the ratio of fuel to the entire air charge at engine loads below a predetermined value of engine load, and igniting said fuel cloud when a predetermined portion thereof is in the vicinity of said ignition point.

19. The method of, operating an internal combustion engine having a cylinder, a piston, a combustion chamber of substantially curved peripheral wall, a passage arranged tangentially with respect to said chamber and interconnecting the latter with said cylinder, timed ignition means in said chamber and timed injection means on said cylinder positioned to direct a spray of fuel across at least part of said cylinder through said passage to be deflected about said peripheral wall, and said ignition means in the path of said fuel spray which comprises providing an air charge in said cylinder and chamber, transferring said charge contained in said cylinder into said chamber, impregnating a variable portion of said air charge in proportion to engine load to form a combustible fuel cloud and moving said fuel cloud to the vicinity of said ignition point by injecting during the compression stroke atomized fuel at a velocity substantially in proportion to engine speed across at least part of said cylinder into said chamber, rotating the unimpregnated portion of air in said chamber at a velocity in proportion to engine speed in the direction of travel of said fuel cloud to prevent material dif-- fusion of the latter, regulating the quantity of air provided in said cylinder and chamber to progressively increase the fuel-air ratio of said fuel cloud and the ratio of fuel to said entire air charge at engine loads and speeds below a pre- I determined value of engine load and speed, and igniting a predetermined portion of said fuel cloud when it is in the vicinity of said ignition point.

20. In an internal combustion engine having a cylinder, a piston, a combustion chamber formed by two adjacent bodies of revolution, two separate passages arranged tangentially with respect to said chamber and connecting the latter with said cylinder, timed ignition means in said chamber and timed injection means on said cylinder positioned to .direct two sprays of fuel across at least part of said cylinder through said passages to be deflected about the wall of said chamber and said ignition means positioned in the path of at least one of said fuel sprays, the method of forming and burning a combustible fuel charge. which comprises providing an air charge in said cylinder and chamber, transferring said charge contained in said cylinder through said passages into said chamber, concurrently impregnating two variable portions of said air charge in pro-' portion to engine loads to form two individual combustible fuel clouds and moving said fuel clouds about the wall of said chamber by concurrently injecting during the compression stroke two variable jets of atomized fuel at high velocity across at least part of said cylinder into said chamber and at least one jet past said ignition point, and burning both fuel clouds by igniting a predetermined portion of at least one fuel cloud when it-is in the vicinity of said ignition point.

21. In an internal combustion engine having a cylinder, a piston a combustion chamber formed by two adjacent bodies of revolution, two separate passages arranged tangentially with respect to said chamber and connecfiirrg the latter with said cylinder, timed ignition means in said chamber and timed injection means on said cylinder positioned to direct two sprays of fuel across at least part of said cylinder through said passages to be deflected about the wall of said chamber and said ignition means positioned in the path of at least one of said fuel sprays, the method of forming and burning a combustible fuel charge, which comprises providing an air charge in said cylinder and chamber transferring saidchargc' contained in said cylinder through said passages into said chamber concurrently impregnating two variable portions of said air charge in proportion to engine loads to form two individual combustible fuel clouds and movingsaid fuel clouds about the wall of said chamber by concurrently injecting during the compression stroke two variable jets of atomized fuel at high velocity across at least part of said cylinder into said chamber and igniting both fuel clouds when the tip portion of one cloud and tail portion of the other cloud are at said ignition means.

22. In an internal combustion engine having a cylinder, a piston, a combustion chamber formed by two adjacent bodies of revolution, a common passage arranged tangentially with respect to both bodies of revolution and interconnecting said chamber and cylinder, timed ignition means in said chamber and timed injection means on said cylinder positioned to direct a spray of fuel across at least part of said cylinder through said passage to be deflected about the walls of said chamber and said ignition means positioned in the path of said fuel spray, the method of forming and burning a combustible fuel charge which comprises providing an aircharge in said cylinder and chamber, transferring said charge contained in said cylinder into said chamber to rotate therein chord forming a common tangent to said adjacent bodies of revolution and burning said fuel clouds by igniting at least one of the clouds when a predetermined portion thereof is in the vicinity of said ignition means.

23. In an internal combustion engine having a cylinder, a piston a combustion chamber with a substantially curved peripheral wall, a passage arranged tangentially with respect to said chamber and interconnecting said cylinder and chamber, said piston adapted to close off said passage during the last part of the upstroke, timed ignition means in said chamber and timed injection means on said cylinder positioned to direct a spray of fuel across or partly across said cylinder through said passage to be deflected about said peripheral wall and said ignition means positioned in the path of said fuel spray within the combustion chamber, the method of forming'and burning a combustible fuel charge which comprises providing an air charge in said cylinder and chamber, forcing said charge contained in said cylinder into said chamber, and rotating it therein, impregnating a portion of said aircharge with fuel to form a combustible fuel cloud and rotating said cloud within said chamber by injecting during the compression stroke atomized fuel at high velocity across at least part of said cylinder into said chamber, rotating said fuel'cloud at high velocity during the last part of the compression stroke by sustaining a high rate of rotation of the air charge within said chamber to spread said fuel cloud into a substantially uninterrupted ring and then igniting said fuel cloud at said ignition means.

24. In an internal combustion engine having a cylinder, a piston, a combustion chamber with a substantially curved peripheral wall, a passage arranged tangentially with respect to said chamber and interconnecting said cylinder and chamber, said piston adapted to close off said passage during the ,last part of the upstroke, timed is- 

